ADC error with calibration VS temperature

HI,

We use nrf52832 on a device with sdk 14.1.

Our product has to work at different temperature (between 20 and 70°C).

We did some measure and found this :

Temperature

AIN_6

AIN4

AIN_7

AIN_5

30°C

2400

2415

572

2293

50°C

2381

2396

566

2275

60°C

2370

2385

561

2266

Gain adc :

1/5

1/5

1/6

1/4

Following the temperature, adc variates even if we use 'nrf_drv_saadc_calibrate_offset'.

Do you have some ideas of what happened?

Best regards,

David

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